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| Content Provider | PubMed Central |
|---|---|
| Author | Holford, N. H. Peace, K. E. |
| Abstract | Tacrine is a cholinesterase inhibitor with activity in the central nervous system originally marketed for the reversal of competitive neuromuscular blockade. Because a marked reduction in cholinergic neurons is a hallmark of brain changes in Alzheimer disease, tacrine has been studied in two placebo-controlled clinical trials of patients with probable Alzheimer disease. Standard analysis of variance (ANOVA) and analysis of covariance (ANCOVA) have shown a difference between the tacrine group and the placebo group in terms of the cognitive component of the Alzheimer disease assessment scale at the end of the placebo-controlled phase. Due to limitations of ANOVA and ANCOVA, only a selected group of patients could be analyzed by those methods. A population pharmacodynamic model has been developed that allows the use of all observations from one or more trials to be combined. It can incorporate any sequence of active or placebo treatments and account for carryover effects of both placebo and active drug. The time courses of active or placebo treatment response and the development of tolerance to active drug or placebo can be defined. The model describes disease progression without treatment, the placebo effect, and the effect of tacrine as a function of daily dose. Placebo effect and active drug effects are modeled by effect site concentration components. |
| Starting Page | 11466 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 89 |
| Language | English |
| Publisher Date | 1992-12-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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